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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0db17de4ee4223f51c5e0296507eb51d8ed9f04d4ce824970a000c25586e6e' 
  AND token = 'yg1br7uyq6s8FT3Q9mT/GS2lHAftC5giO6z15H/oMcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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