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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f6c9a1c02ef9747cacb9e5812a4bf97eda97c630233c6e58b914633051df4b' 
  AND token = 'ie2TlHgIUIo1uKyT+IGjnfYK5fzxtPiOFd8AEo/scN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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