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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30df11e9baffaa759e9fd05b5ee3883f630de2c7961a74bdf3abb1cf60c53f5' 
  AND token = '06KtTU2MhzWhB+wlH/odNPoFusFwsLe6gJ6EdknrjY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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