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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe69c1d03a6e5efa39dd50fc6fd69488eeb6410a22bccc1f143ce781dac8513' 
  AND token = 'lL+4/pjxPB3Ca8ATkHBjsAdW08tDHNvqiCZ4lzIjOJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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