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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abb74efe27fa97da41775bd88d5ae7cefdd4f91a5f2f23902c55858981dd75c' 
  AND token = 'RKGjP+pj3ISvuuHk/v/jHTIpmLeJM7qQ7NnFYzkMlck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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