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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8893917a629e67f99d3f2116c2fe3c2c3aa918d2cce9f67a11e96561edd0fdf1' 
  AND token = 'Arq5EtnlOa/CQIHxNPA9G2qkicSRhzrBNcQMaQBUoKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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