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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a35418f04db21538638d34e8d11ef4718b4c915e1724dd8ee1a5d3daac3051' 
  AND token = 'Fn9ss9NCI0E+NQBJ9Y8l0L2g2FNvuxkcF2SS1ToEj/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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