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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abea3efff0f78b20809406230c498796978f3ab2259cea79c24026291d2c8a2d' 
  AND token = 'Z1p/eO79ObihRUjs3ytqUjLV3NUkbdlNvX5phWIFMus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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