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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64330572057fd864fc753dde5e7c02d2a77bb4867ce31f030b5506c77023d6e5' 
  AND token = 'hzf3iQwz6UFqAYAzLZ7WQsbONlKvdkkLswTnpHkgbCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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