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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2e32b2dee55a436652297e64c133d6a8775c93b2a5c411fd616cce9235dcb8' 
  AND token = 'h+17MD6+dQxLir2dg9/AYDoKruV2ywC96HIQ9I3a8J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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