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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf6415f22868105e44682d702be8f0363239c4ea2a593b58008bab4579e6724' 
  AND token = 'SP2iq6mKZsTywBml5nIYKuAUMKEiwRDB00R+eF03w8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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