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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa1452378c817aff48c2e5e073a68b4a2aa84818274fd69d5ae98e2789b0902' 
  AND token = 'ujsVFP0Uh0buS8phe8Rczr8fBVitZ2rJJ1Uj61M9iqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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