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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3d05db2d80e064e2e468217de77a7c47785653ac514282d2cba2d7208683bf' 
  AND token = 'aX3vz4otKPy4f703UQRu3rjTIie3TyzPz5rn1JIom2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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