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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8af6a86f73eb23ed6c1d3f738dbc9ea28177915e78b622a9799dedc884a637' 
  AND token = 'WTlbAorhMI+9O9O9VBtc2cGNljI9EOXl9nqjQCKs+48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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