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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9701b70fc0addc64332e701f4a2522d6d0f1d1563708ae58cfb00a889fc35a80' 
  AND token = 'm2wxHMduuljbcSm4PLgBixj0QJ4eJLO9KClxpEZ2kKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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