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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bb2c87c93f733388ee8fac32a0893258f44f264339805d0b42960691d71262' 
  AND token = 'p46Q8c2Nf95lb9imvBs9Cb+mBA+JVKZSNyduc8EhMyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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