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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ba283b16544f10e7a4e1f6cea626f0283490b27f5bf61b4e49815cce7cb766' 
  AND token = 'U9ku+vrjo45OxD0sy/ohEy2wCwUQ/VrbhuCjvht0D38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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