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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bf84d78e53755036bcd5e5a52ea6a3cc2ceef215b739a8c80b6643f8deab1e' 
  AND token = 'voSVXOMGB5jtmfiaMif9Ft0xIT/7uJpZGrqVJ7GBjno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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