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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3654c6a1acd710df88ab967bb0ea872e58524acf90a4fdd79b65f54de7f068ac' 
  AND token = 'BUvtNvEe9hofdmmGPma/0L5Dl36ZDK5vR1MHuNop53Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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