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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d5bd5bacbcad6212ad4c40db8569fdab9b631ab7aa1db3c283e22f211a5f61' 
  AND token = 'sRLtj05GJfowOL/LLRrItb4KCy6StEutrmvJ9Dpd710=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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