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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee2c9ec9d541fcbc12b2a1ac433a2af067c38986fe9e4770a789eb159c148a9' 
  AND token = '15wrU0ifRZUG62SltDDRDIvaiEPVbdGVLPXfEFpaXv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}