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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740e697604a59872265f0c5c922023f5fed9bbf61ccc91423b61f9e8a1c1e847' 
  AND token = '4Pas2rXaMbDtH6FlbqjYIlWP5KIcQe9t8z8o1HmNbsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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