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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a19d86d3e615bc5b72b99d8b965bea397a35d3d37d62347f0f3dea4c14773b' 
  AND token = '/6SQPBycX0jgdFRdM69cpWZywxqdpoJodCJ0QkFnBWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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