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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530a2a4c0e0c5328ce0e776c8cfa1ed76ab4e4b43ed077b41c55089861af3744' 
  AND token = '65gNoKzwuiqmaVy+QhdAsKcadoThtjSPxzeA/h5sXT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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