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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85307580fc42cc91f19e44d94b21b4f267aca72b7a83a399be190fc1036ef53' 
  AND token = 'ZvGs7NrT5AWRLwNJfOf4rJkigYlfOlhIbTiWCC5z9N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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