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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73f93818a526b8a173c40b08e88bfd3a0cc4f5cdfc5dfe16b72f36ec815da47' 
  AND token = 'V4eYwPB4fHtqBByIRt5CBriw/bWs2mmzgRghkmyJoI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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