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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1415feab86c37b5699d3bb746cfcd2870537ee098a099ed22cfba3ea7c60e2ea' 
  AND token = 'x2d1hNVffjTGFaPuJEzqPlNDI2qNBi9KhLJ05q8dnG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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