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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d9465b6e75e652348b361e37e64500ebc63662c0480a7821e1dd245e94e25c' 
  AND token = '1j+jTaAwU7tv3oOwrQy46o2dv8+O7SH63op/PCUS2Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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