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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e997ea49d3f77b4077f0a93df853b5d844e3e13fca0191a77afa560a45311d60' 
  AND token = 'oVoj3nfMV6P98v8i9jPRi6Hw49KrqXFwQt0M0/fmadc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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