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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a114ef9ed358de15b6c29f88bbb1ab888b5b4d9e54a0c938b13a11746f13c9e0' 
  AND token = 'w/K5Y1VsDkQhX5pCX2g5LuwsxFzZ5vrd4soLpSZQ/DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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