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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4b8a3bc5a6a2732fc4547b55e638959c9f35b896db8d2a2d94319f9bdd7fb7' 
  AND token = 'O+1NODOBEHwMVuvHNY3Z6g9+iV1NTgIyMniapDPkU3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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