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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee57de0ff6efba45f43a2abcbeb1b2976d6f8db9654b026ff31769a6409a3e9a' 
  AND token = 'xvsRnv93ew/ZdQKQfdznLSplot9wzXS0ph42/ygRCKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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