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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7194a30574f70da10da6ca135c5e90120656479ab996d12e23d8b7990718e5' 
  AND token = 'JLHwA+DuA7Pq2QjIXgvRdWnZPc/q5dIN8OmS4sEEp6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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