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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1ff3718cc649bb8296d682d3beab9741cff5310a6ceaea4a439ee03360f89c' 
  AND token = 'VjPIHjt2sURcEZ+K4wa3QOHHjJ+dAlEmZbmvm13E9D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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