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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a962aaf40acf61cf0b7af86c5a831d86e36af2b71d6c49231809900b932142' 
  AND token = 'nraJ2pSD+8WIHixYg8dx1a1BEniOyuMsUpTAKXfLCUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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