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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4591017097d43e90a75ed210306aa4e07ae2b938c8255c192596e4eb6c597db8' 
  AND token = 'Exu9SpsaN7QzSRE+X05sdB3OJdii/dOggYu87BzB0aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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