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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028bc7565ede74ebe19ab2ec06325023ca53fff552f36bca9620fbad613e20d7' 
  AND token = 'fXcqBYhYac+ib/rJMpSeYwMgl008XItFJK3drjkwNbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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