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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebea16b7de2995ab1edb22c5e3b3b535592a1086a60497a32b72a6860b661e09' 
  AND token = 'jnaYmLtkSRTl0gUtnpHlnGoEBUYGoxxHu/9CdyT4bQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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