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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc441f5906e248e4c1266186b5b810acb2ee8a5fe25716e2268c1ea0414d8966' 
  AND token = 'Pg1BG8AXWFkSQImsboy3CR5ov2h30qWybj45BfzVEeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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