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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0bef109480919e3d36aaddd61cb8a720819ab3b92d6b2ef9a0d2a5f8622fb0' 
  AND token = 'L3w3YCC6LUkUWDZ1GWT+HxsYeLUGQHqwYRiOOk+ORpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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