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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e232eb9bff5887037526efde037f1f1f4c4cb532ba66c738d551bb58d9545847' 
  AND token = '7oqHEfDsyImbYKAr6d3dlTEa1Iy0Qu4HOMipgyW3yHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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