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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598d53a25b60be0e607c7c826273e2953508317330cff34634adf860f2f4df3e' 
  AND token = 'L3u1+Wh7nRYC/HWwG6a7YrFABE8ywiV7Wh0+1HykMv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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