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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6090db82f9c342edce4431ecbf66ca26b0c7ba927fd9cd0f2eecb6471c74e5e3' 
  AND token = 'gxqtUleVXOyRE2xCOuWwo51g54YYmJ1WyWNJTNXInWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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