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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6b637e3e43386cf76610b0fff693c655a4f280878fa4ed305b3fbd31d0d67a' 
  AND token = 'QTpu0YGq8W+HRS+C9gpqMYS54zMECEIvBWw73CckZ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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