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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7328f2fd071a8ae7e2954e82dafb9cde2724bc74ec33727d54f42946e7a71c2c' 
  AND token = 'uj7SgtU+PubUN5I+5vpi8tZG6MkEHrqYlu8sFgkqbwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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