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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c36573d94fbb26cdde70f4ee8f9d794409eb671d6beeeaabea8e16da2d50cb2' 
  AND token = 'Ix4/85c4FO0RI4xADxWxEiKiWGMv+idV3utNB1CWy4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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