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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d44682c524ea0bf50d1b65394bcfd63c2a145ca41fddad293d42962fd412924' 
  AND token = 'EPJ2TH0VuXeBTJnO2pwQ01VjyNCL2f/t3qsKvGMH2Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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