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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24617068048d7ce02c832afb6ebb58655fc2e25b0cdd124c90393160f9821a7' 
  AND token = 'w8RMDU6mN+m+738dnNSU2DdcLDF4if2YmWAiOsdcw4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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