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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a13a81bdbdb4bf2c1990c21079441cecf2b0692a5b64ebd22d01bda9bd5a12' 
  AND token = 'behQqKBNITFNPcGbndLHNx5F4X15UObk+ITV7vH+Lzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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