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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3692bf672e9afad0fe793ed89f4076fa41331e379c55472276722583d4f74840' 
  AND token = 'MpO6pkFwW8QBkjQfjCKB/U8M6yorcqcCIR65ZQjWVwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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