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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a26d7cc9b006cbea9d4551c26e7773da39bd3f39225f86880d93676f5e5cf01' 
  AND token = 'TBUcd8Zd9o4EaBGAMJOlkIr65SV1EUr/ZjiW1Sd4R64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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