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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c126c2ea1a3b41b4234ad1767255b13c6d6d7166b22d41efe5e7c9113c2be5fb' 
  AND token = 'mYfW85tVY4hraS5v1QfETcmbmO04hpTH4yw9hp2cl7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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