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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb51a737fe27e50f214c918208bebb5adf2f380379db93281796ff17a3b0c17' 
  AND token = 'HpIdt2m2z9Tl836lr3+Ioz4QkvLswEOtEug8V9zEKmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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