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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6554d55e03b48393bb8c9136da4376259835c7854b5340906cb508b622ffec2a' 
  AND token = 'dns8Gns1zCYPAeI8nroKlO78tW2u/cHap9bSKBkvhx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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