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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6440193f9c0557918c2949145d5825576292bb9fa7998b81ce0e5fef79a616' 
  AND token = 'd+2KSTUqEqsY+4a/VW1Xe6HxSSiWxGckcyJzY0RB8v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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