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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d139b4c92b55877d49c3d4fd2bc9603df1385330923d41a92bda3dea4670e7' 
  AND token = '8wvX5sGMPPrxa2HyV6vKEcKeFO7TYaMHEi6dHlgz4jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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