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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16232d5c6860aa002641fda790fb8f706c0e2be81f4acc366b1160b038a8003e' 
  AND token = 'jvC/xihLu3nAPEm0A4bxkY7gEbCY7yrzIAsBxwxx0A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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