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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe8f7f4248100e29addf9913d9b4dd07d12f1b9a4a2f3545cbaea1a3d24169d' 
  AND token = 'GnaT1zS3VuOvxAAaH6X92FRcI0/RAkUymwtqig2DjOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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