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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d2352a4c10faf32e6d7074890a5c5f8057a4331b0c81dd9908087f8bc3b354' 
  AND token = 'jmv1nadlVIh8sp7Fo5Sd93R/WrHiExEw6m3GF6nqeKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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