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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4479228e0bb79a6fda10331a2ac66f50ee9702343b94e31b85dfa3e4fba0818' 
  AND token = '5sjFf6Y4O6IgoJVktT4EcKGYZsgAMLqHQL7lSfLR3pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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