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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8068c558c9fe1625933450a8f6ff8040d2b82f7514113c29fe6b37c5698c22a1' 
  AND token = 'DH0TmIYpjcldBVsqHI0dfOTYPkNVl8MrV3Jq8jKOVPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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