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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136c97c12ff2efd449cabbfc540101258055ebe9783b20e3432a421e3ff50ee7' 
  AND token = '/2SKaOKpLo/l4/XP9E41ZLFKJlpred/4zzqQFNxuuK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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