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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aeacda169b07321eac30fb31d0c13a72c15f0b77c6f70f9c5ecfd8b3cd9bf43' 
  AND token = 'IQyBQGZKf0v5kT0+q5ohwiSQ/dxapGXNM+zko23REDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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