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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f4e9571a3905e37cd20656b66503f28d72a7f2e25ec213ac50042f29007acd' 
  AND token = 'FKHkcdaPvtVz2NDJ6kHyyTqS1yDn2zrvsY74Q3QVzg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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