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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ab4e7505bc793f22491d84e4e0fbd0c21e2dd3a2cfb15d0c7a5c71373c8a64' 
  AND token = 'BbIbrJRTrc/DQzZVESta24NAUQONHgy/EcGIF0pSkVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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