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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec533edd69d7a2b4b83b77a9a7ea3091180402422ef5736038162a7da79be07e' 
  AND token = 'YFDeS7qvFUJxNPPyxzn0+yeMZRcl/qjHxZl0JO2vBew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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