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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac69c6765d1991f5e32aad2862249b9ef917a813c131a885737ab579bf0f1f7' 
  AND token = '9bzJGvWRbtkVu3mUk/AtkriVdVJpbi8va2IdKu4woNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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