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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cce3274f42d5eaa63cbb8a326e930e191cce5376ba7f9b9a81836cf5960a61' 
  AND token = 'cbftjSTrX5ATPR6mvhEm/l4il4STP57zQIHrrKrubXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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